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Simplifying -20 + -6a = -4(5 + 7a) -20 + -6a = (5 * -4 + 7a * -4) -20 + -6a = (-20 + -28a) Add '20' to each side of the equation. -20 + 20 + -6a = -20 + 20 + -28a Combine like terms: -20 + 20 = 0 0 + -6a = -20 + 20 + -28a -6a = -20 + 20 + -28a Combine like terms: -20 + 20 = 0 -6a = 0 + -28a -6a = -28a Solving -6a = -28a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28a' to each side of the equation. -6a + 28a = -28a + 28a Combine like terms: -6a + 28a = 22a 22a = -28a + 28a Combine like terms: -28a + 28a = 0 22a = 0 Divide each side by '22'. a = 0 Simplifying a = 0
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